EP2550394A1 - Procédé et dispositif pour nettoyer des habillages pour machines à papier à recycler - Google Patents

Procédé et dispositif pour nettoyer des habillages pour machines à papier à recycler

Info

Publication number
EP2550394A1
EP2550394A1 EP11710471A EP11710471A EP2550394A1 EP 2550394 A1 EP2550394 A1 EP 2550394A1 EP 11710471 A EP11710471 A EP 11710471A EP 11710471 A EP11710471 A EP 11710471A EP 2550394 A1 EP2550394 A1 EP 2550394A1
Authority
EP
European Patent Office
Prior art keywords
material particles
measure
particles
fabric
cleaning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11710471A
Other languages
German (de)
English (en)
Inventor
Torsten Kallweit
Matthias Schmitt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2550394A1 publication Critical patent/EP2550394A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/0224—Screens, sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/0237—Mechanical separating techniques; devices therefor using density difference
    • B29B2017/0241—Mechanical separating techniques; devices therefor using density difference in gas, e.g. air flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/733—Fourdrinier belts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention relates to a method by which paper machine clothing can be used after the end of its useful life in a reprocessing cycle in order to be able to provide from the building material of the same starting material, for example for new paper machine clothing.
  • the present invention relates to a method by which papermachine clothing of contaminants accumulating therein in the papermaking process can be separated to provide high quality feedstock in the recycle cycle.
  • the present invention further relates to a device for providing rebuilding material of a papermachine fabric with which, for example, a previously explained method can be carried out. During the service life of papermachine clothing, these are also cleaned in the course of paper production in the paper machines in order to avoid excessive contamination of the clothing.
  • Such impurities may affect the quality of the paper produced due to the effect on the dewatering properties of the fabrics, on the one hand, and because of the creation of marking effects.
  • To clean the paper machine clothing therefore generally mechanical or abrasive working procedures are used in which, for example, with scrapers, brushes and high-pressure water jets or even with the use of dry ice impurities are removed from the paper machine clothing.
  • this object is achieved by a method for cleaning paper machine clothing, in particular forming fabrics, dryer fabrics, belts or press felts, recovered, reprocessed building material, comprising the measures:
  • the inventive method is characterized primarily by the fact that it is dry, ie without addition of z. B. of water or dry ice.
  • the removal or detachment of contaminant material from the clothing material particles obtained in the first process stage or the clothing itself is essentially mechanical.
  • the fabric or the covering material particles are moved against one another or against surfaces of other bodies.
  • the occurring shear forces or abrasive forces contribute to an efficient cleaning of the covering material particles.
  • the subsequent separation of liquid on the one hand and cleaned string material particles on the other hand is therefore not required.
  • the fabric particles obtained from the cleaning procedure can thus be entered directly into the reprocessing cycle. A drying or treatment of the separated contaminant is not required.
  • a cutting mill is used to cut the paper machine clothing or larger segments thereof to obtain the string material particles, in particular by the action of the cutting knife, the detachment of coarser impurity particles is supported.
  • particles of covering material are produced essentially with a predetermined particle size, wherein preferably the predetermined particle size in a range of 2 to 30 mm, preferably 10 mm. It has been found that when shredding paper machine clothing, for example by means of a granulator, the fabric particles thus obtained have a size which, even distributed over the plurality of particles, will not deviate too much from the predetermined particle size. That is, the size distribution is comparatively low.
  • the measure b) may comprise sieving and / or sifting to separate the string material particles from the particulate contaminant material.
  • the measure c) that is to say the friction cleaning procedure to be regarded as a fine cleaning, may preferably comprise the movement of the string material particles relative to one another.
  • the fabric particles themselves thus act as abrasive material and remove the contaminant adhering to the surface of other fabric particles. Since this process is generally in Of course, if there is a closed volume, and there may also be assemblies therein that set the string material particles in motion, they naturally also come in contact with the volume limiting surfaces of motion inducing assemblies, which also contributes to the removal of contaminants from the string material particle surface ,
  • Contaminants adhering to the surface of the string material particles include, among others, impurities called "stickies" which often have a resinous character and are composed of materials contained in the pulp used in the papermaking process and attached to the surface of the pulp In order to assist the detachment of these partly sticky or strongly adhering impurities, it may occasionally be necessary for the fabric particles to be brought into contact with the extractant when performing the measure c)
  • Such a means of extraction can, of course, be used depending on the impurities present
  • the use of such an extractant dera rt takes place, that only so much is entered that the surfaces of the covering material particles are coated or wetted, but in principle no dispersion containing the covering material particles is formed. In this respect, even with the use of such an extraction agent, it is still possible to speak of a basically dry cleaning process. As a rule, can be dispensed with the addition of an extractant.
  • the measure d) can also be carried out in such a way that it involves sieving and / or sifting to separate the string material particles from the contaminant material detached therefrom.
  • the contaminants or contaminant particles released from the covering material particle surface will have a significantly smaller size and therefore also mass than the material particles themselves, for example also in powder or lubricant dusty consistency and thus more efficient both by sieving and by sifting Can be separated from the string material particles.
  • Both the sieving and the sifting itself continue to set the string material particles in motion so that the contaminants that are released, but possibly re-attached to the surface, can be efficiently separated from the particles of the string material.
  • the contaminant material adhering to the surface of the string material particles may have a resinous, sticky character.
  • the Beêtsmaterialp in the range of a predetermined temperature , preferably at about 25 to 30 ° C, are kept.
  • the present invention relates to a method for reprocessing the building material of paper machine clothing, preferably forming fabrics or press felts, comprising the measures:
  • the covering material particles obtained from the cleaning procedure are already largely separated from impurities and no separation of liquids or the like used in the cleaning procedure is required, especially when the covering material particles or the papermachine fabric shredded to obtain the same are constructed from a single basic material or can be used ., were without further procedural measures, the procedure for granulating and thus to obtain a usable, for example, to build new paper machine clothing granules can be initiated.
  • the paper machine clothing used as starting material z. B. be constructed with threads of different base materials, it is further proposed that after performing the measure A) and before the implementation of the measure B), the substantially purified string material particles are separated into particle fractions of different base material. It can thus be ensured that the granules contained after the granulation procedure are not composed of mixed materials, but of the basic materials previously used in different threads.
  • Extrusion process preferably with filtration of the extrusion material comprises.
  • a device for providing rebuilding material of a paper machine clothing to be reprocessed comprising one A crushing section for crushing a paper machine cloth, a friction cleaning section for releasing contaminants from string material particles, a separation section for separating the string material particles from contaminant material detached in the crushing section and / or the friction cleaning section thereof.
  • Main crushing unit includes. It has been found that it is particularly advantageous if the pre-shredding unit comprises a single-shaft shredder or the main shredding unit comprises a cutting mill.
  • the crushing section which includes both string particle material and particulate contaminant material, before passing it into the friction cleaning section, it may further be provided that between the crushing section and the friction cleaning section there is a pre-separation unit for separating string material particles is provided by in the crushing section thereof detached contaminant material.
  • a gravitational separator has proved to be particularly advantageous.
  • the friction cleaning section provide the separation section.
  • the friction cleaning section comprises a screening unit, preferably a tumble screen unit, with at least one, preferably at least two, screen layers. It has been shown that the use of such a tumbler sieve unit, in particular when at least one sieve layer is assigned to a brush arrangement, on the one hand leads to a very good friction cleaning result, on the other hand, the separation of the dissolved contaminants from the fabric particles contributes to an efficient cleaning.
  • the separation section following the friction cleaning section comprises a post-purification unit.
  • a very pure reprocessing material is obtained, which can be fed to the further reprocessing process, for example granulating, without any further processing.
  • the post-cleaning unit may comprise, for example, a dry-cleaning cylinder.
  • FIG. 1 shows a schematic representation of the process steps occurring in a cleaning process or a recycling process for a papermachine clothing
  • FIG. 2 shows an illustration of a device with which the method explained with reference to FIG. 1 can be carried out.
  • a papermachine fabric B to be reprocessed after removal from a paper machine is provided.
  • this fabric B may be formed as a fabric or as a composite of a fabric or other support structure with a fleece or felt-like material.
  • spiral screens are used in paper machines as a covering and can be recycled in the manner described below.
  • As a building material of such paper machine clothing B generally polymer materials, such as.
  • PPS polyphenylene sulfide
  • PA polyamide
  • the paper machine clothing P provided for the comminution in process stage S1 can first be cut into individual pieces in order to be able to comminute them successively in a granulator or at the same time also in several granulators.
  • the device used for comminution so for example granulator, be set to a predetermined desired particle size, which may for example be in the range between 2 and 10 mm.
  • Cutting mills provide after cutting a cut particulate material, which has only a relatively small mean deviation from the predetermined particle size.
  • step S1 that is, when shredding the paper machine clothing B, not only are their filamentary or nonwoven or spiral-like constituents comminuted in fabric particles having the desired particle size, but also larger or particulate contaminants still present in the papermachine clothing are released.
  • This is due to the fact that acting on the paper machine clothing B and by moving individual parts of the paper machine clothing B against each other forces by the action of the cutting blade, which dissolve the only relatively weakly adhering particulate impurities. Since the particulate impurities have a comparatively porous, friable consistency, they are due to this mechanical action by the cutting blade and the impact, frictional and shear stress in a crushing chamber not only detached from the Beêtsmaterialpumblen or the fabric B, but also comminuted. The result of this is that the particle material thus obtained contains stringing material particles which essentially have a particle size in the predetermined size range, as well as particle-like contaminant material whose particle size is generally below the particle size of the stringing material particles.
  • these two particle fractions ie the string material particles on the one hand and the particle-like contaminants present at least partially in dusty configuration, on the other hand, are separated from one another.
  • Various procedures can be used for this purpose.
  • sieving e.g. by means of a tumble screen with brushes, to separate the fractions, wherein the sieve opening size is selected so that the string material particles are retained, but the particulate impurities fall through the sieve.
  • the covering material particles obtained after this separation step S2 generally still have theirs Surface adhering impurities. These form a film-like dirt coating or comparatively strongly adhering deposits. These impurity materials generally consist of resinous or sticky substances contained in paper production in the pulp used to make the paper and coming into contact with the fabrics and accumulate on a fabric B over the service life. Since these relatively strongly adhering contaminant materials in the first process stage S1, so when crushing and the effects occurring on the surface of the string material particles, not or only partially can be removed, are already separated from the coarser, particulate impurities in the process step S3
  • the friction cleaning step S3 can be carried out using various per se Known devices take place, which are used to generate by energy input and mutual movement of particles abrasive effect on the surface.
  • Such devices are used, for example, in the food industry to rid of cereal grains, rice grains, peas, lentils, dried beans, pepper, millet and the like of shells. They are known as so-called brushing, peeling, rubbing, grinding or polishing machines. Depending on the extent of the contamination or the impurities adhering to the surface of the covering material particles, it is also possible to use various of these devices in combination.
  • a separation stage S4 for example, again using a screening process or a visual process, a separation of the then substantially completely cleaned covering material particles from this contaminant material is achieved.
  • this separation process in particular when it is carried out in a sifter, but in principle also when using a sieve, a further mechanical action is obtained on the surface of the clothing material particles, so that not only already separated contaminant materials are separated, but a further surface cleaning is achieved .
  • the separation stage S4 in which an abrasive action is also obtained on the fabric particles, as the sole friction friction stage with simultaneous separation of the fabric particles from the dissolved contaminants , This means that the stage S4 then not only provides the separation stage, but at the same time also forms the friction cleaning stage, so that the stage S3 which can be seen in FIG. 1 and serves exclusively for friction cleaning is not required.
  • a separate separation stage does not necessarily have to be provided after the crushing carried out in process stage S1.
  • the particle-like or partly also dust-like material resulting from the comminution can be achieved directly in the friction cleaning process and in the separation of the covering material particles on the one hand from the contaminating materials or impurity particles on the other hand. This will be explained in more detail below with reference to FIG. 2. Due to the fact that during the comminution process, the particles of contaminant released from the covering material particles partly become powdery or dusty However, it is advantageous to achieve a separation of this already dissolved contaminant material before the friction cleaning process.
  • the efficiency of the friction cleaning process can be increased if less contaminant material, in particular also dusty contaminant material, is included in this process and thus essentially absorb only the string material particles with possibly also adhering impurities the energy used for the friction cleaning.
  • the separation stage S4 can be carried out with or without upstream Fritationshabilitsease as already mentioned, preferably in a sifter.
  • a so-called zigzag classifier, air classifier or cross class separator or plansifter can be used.
  • the string material particles can be separated from the dissolved impurities, due to the turbulence the particles collide against each other and against the chamber wall containing them and on the one hand, the release of impurities is supported, on the other hand, the separation and the discharge of substantially Impurity material and coarse material substantially provided by the cleaned string material particles.
  • process stage S3 In the process stages serving the friction cleaning, that is to say in particular process stage S3, if necessary also process stage S4, the comparatively strong movement of the particle material, ie intensive energy input, generally causes heating of the particle material due to the frictional action which also occurs.
  • This can, in particular if the impurities still adhering to its surface have a resinous character, lead to an increased smearing of these impurities over the surface of the surface Cover material particles lead, since by increasing the temperature, the viscosity of the adhering contaminant material decreases.
  • a temperature level in the range of 25 to 30 ° C should be maintained, for example, by blowing appropriately tempered or cooled air.
  • the fabric particles are generally in a form which can be used directly for granulation.
  • the initially fed papermaking fabric B was not constructed of a base material but, for example, has contained filaments or filaments of different base material.
  • the mixing of such base materials during the granulation process is generally not desired. Rather, each base material or each particle fraction of a particular base material should be subjected by itself to the granulation process, to obtain correspondingly back a granulate from this base material.
  • a separation of the fractions of the covering material particles different base material can be made.
  • This separation can take place in various ways, preferably again taking advantage of the density differences of the various base materials. So here can be supported by the density separation centrifuging or a sifting be vorgenomnnen.
  • a sieving assisted by partial agglomeration can also be used to separate the fractions of different Grundmatehals from one another, and then to separate them separately into the granulation process.
  • This granulation process takes place as the last process step S6.
  • the last process step S6 for example, in an extrusion process using high-vacuum filtration or melt filtration, it can be ensured that the last contaminants still adhering to the surface of the covering material particles are removed.
  • various extrusion filtration techniques may also be used in combination. For example, so-called filter cascades or self-cleaning melt filters with automatic scrapers can be used.
  • granules of the desired grain size and with high-purity construction material are obtained, which can be supplied to the papermachine fabricating process, in particular to the production process of yarns used for the construction of papermachine clothing.
  • a device generally designated 10, will be described below, with which the above-explained method for cleaning paper machine coverings to be reprocessed can be carried out.
  • a hopper 12 in which a pre-cut into larger pieces paper machine clothing is entered.
  • the pieces may be parts of paper machine clothing or whole papermachine clothing and are passed via a conveyor belt 14 to a guillotine 16.
  • these paper machine clothing pieces are comminuted by a cutting blade 18 provided therein.
  • the guillotine 16 already forms part of a comminution section, generally designated 20.
  • the pieces of paper machine clothing to be reprocessed from the guillotine 20 are fed into a pre-shredding unit 24.
  • This is formed in the example shown as a so-called single-shaft shredder 26.
  • the rotating shaft of the single-shaft shredder 26 the pieces fed in from above via the conveyor belt 22 are drawn into a shredding space.
  • the material to be shredded can be pressed into the cutting space by means of a movable slide. Should the shaft of the single-shaft shredder 26 get stuck, it can move into be moved in the opposite direction to drive them free. In addition, in this case, by opening a flap of the cutting space, access to this can be obtained to remove the shaft blocking pieces.
  • the conveyor belt 28 conveys the material delivered from the pre-shredding unit 24 which, for example, when the fabric to be reprocessed has a fabric structure, may still comprise at least parts of a fabric structure, to a main shredding unit 30. In the example shown, this is designed as a cutting mill 32. About the conveyor belt 28 conveyed pieces are entered from above into the granulator. They fall down into the cutting room of the granulator where the cutting shaft is located with knives thereupon.
  • the components of a paper machine clothing supplied to it are comminuted to a size in the range of about 1 cm to 3 cm.
  • a sieve can also be provided at the lower region of the cutting mill, so that in fact only correspondingly comminuted material is dispensed.
  • the granulator 32 ie, the main crushing unit 30, constitutes the final system portion of the crushing section 20. From this crushing section 20, the particles produced therein are then conveyed further toward a generally 34 designated Fritationsstainsssetation. It should be noted, however, that in the crushing process in the reprocessing paper machine clothing containing impurities are detached from this or the string material particles. By the crushing process, at least some of these impurity particles are very finely crushed or ground. Smaller particles can also be detached from the construction material of the paper machine clothing so that the entire comminution process can lead to an attack of very fine particulate material essentially provided by impurities. It may therefore be advantageous to effect a separation of these very fine, dust-like particles before they are introduced into the friction cleaning section 34.
  • a gravity separator in particular a cyclone may be provided at the output of the cutting mill.
  • This can be extracted together with the further processed particle material from the granulator 32, dust-like particles, so that already a pre-cleaning or pre-separation of the Fritationsquesssetation 34 to be supplied to the Beêtspumblematerials is achieved. It has been found that this extraction of dust-like contamination is therefore particularly advantageous because it can significantly increase the efficiency of the subsequent friction cleaning process.
  • the friction cleaning section 34 may be constructed with a screen unit 36, preferably as a tumble screen unit 38.
  • a screen unit 36 preferably as a tumble screen unit 38.
  • the covering material particles are applied from the top of the top sieve and set in motion by brush moving on this sieve, preferably so-called triple nylon bristle strands. This move the Covering material particles on the screen and against each other. As a result of the resulting friction, adhering impurities are removed on the surface of the fabric particles. Furthermore, the movement of the brushes on the screen causes increased penetration of particles through the screen.
  • This process can be repeated from top to bottom in several Sieblagen so that each screen a fraction of stringing material particles remains whose size does not allow passage through the openings of a respective sieve.
  • balls constructed of rubber material can be arranged beneath each screen layer, for example. Due to the movement that takes place these rubber balls are set in motion and thus encounter from below against a respective Sieblage. This sieve openings clogging particles are released.
  • the upper sieve may have an opening size or mesh size of about 2 mm, while the lower sieve may have an opening size or mesh size of about 0.6 mm.
  • Those particles passing through both the upper and lower layers of sieve are nearly 100% delaminated, generally dust-like contaminant particles.
  • the sieve layer formed with a smaller mesh size a proportion of about 94% by weight of the covering material particles remains.
  • About 2.7% by weight remains on the upper screen layer, which means that about 1.8% by weight of the input starting material is removed as contaminant material or loss material.
  • a further sieve layer with an opening or mesh size of about 1.0 mm can be arranged between the two upper or lower sieve layers already explained above be provided.
  • a finer graduation of the particles retained on the individual sieve layers takes place. It has been shown that with such adjustment of the mesh sizes again about 2.7 wt .-% remain on the upper Sieblage.
  • This Bechingsmatenalpelle essentially have a length of at least 2 cm.
  • On the middle wire layer, which has a mesh size of about 1 mm remain string material particles having a size substantially of at least 1 cm. Their share is about 47 wt .-%.
  • On the bottom wire layer also remains a share of about 47 wt .-%.
  • the friction cleaning section described above serves not only by the counter rubbing of the individual covering material particles to a detachment of impurities, but it also the Beêtsmaterialpelle be separated from the impurities detached therefrom.
  • the particulate matter discharged from the crushing section 20, which may include both stringing material particles and impurities may be subjected to both a separation process and the friction cleaning process.
  • the various sieve layers hold back covering material particles, while the smaller or even dusty contamination particles can fall through.
  • the retained string material particles are then agitated by the brushes acting on them and rub against each other, thereby releasing further contaminants from their surfaces.
  • the friction cleaning process can be performed very efficiently.
  • the total surface on which the energy used for friction cleaning is distributed, is significantly smaller than in even further shredding the paper machine clothing.
  • the particulate material taken from the various screen layers is subjected to a further purification process in a post-cleaning unit 41 in order to remove the last impurities.
  • a dry cleaning cylinder 42 can be used.
  • the covering material particles emerging from this can then be directed to a filling station 44, where they are packed, for example, in sacks and then supplied for further processing, for example granulation.
  • the filling station 44 it is also possible, instead of the filling station 44, to provide directly a device in which covering material particles are further processed, that is, for example, subjected to granulation.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé pour nettoyer des matériaux de montage à recycler, provenant d'habillages pour machines à papier, en particulier des tamis de formation ou des feutres de presse, qui comprend les étapes suivantes: a) déchiqueter un habillage pour machine à papier (B) pour obtenir des particules de matériau d'habillage et détacher ce faisant les particules de salissures, de l'habillage pour machine à papier et/ou des particules de matériau d'habillage (S1), b) séparer les particules de matériau d'habillage des particules de salissures (S2), c) pendant ou après la conduite de l'étape b), libérer les particules de salissures adhérant à la surface des particules de matériau d'habillage obtenues à l'étape b) par nettoyage par friction (S3, S4), d) pendant ou après la conduite de l'étape c), séparer les particules de matériau d'habillage, des particules de salissures libérées de la surface des particules de matériau d'habillage (S4).
EP11710471A 2010-03-24 2011-03-21 Procédé et dispositif pour nettoyer des habillages pour machines à papier à recycler Withdrawn EP2550394A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201010003196 DE102010003196A1 (de) 2010-03-24 2010-03-24 Verfahren zum Reinigen von wiederaufzubereitenden Papiermaschinenbespannungen
PCT/EP2011/054201 WO2011117176A1 (fr) 2010-03-24 2011-03-21 Procédé et dispositif pour nettoyer des habillages pour machines à papier à recycler

Publications (1)

Publication Number Publication Date
EP2550394A1 true EP2550394A1 (fr) 2013-01-30

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EP11710471A Withdrawn EP2550394A1 (fr) 2010-03-24 2011-03-21 Procédé et dispositif pour nettoyer des habillages pour machines à papier à recycler

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EP (1) EP2550394A1 (fr)
DE (1) DE102010003196A1 (fr)
WO (1) WO2011117176A1 (fr)

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DE102012201613A1 (de) 2012-02-03 2013-08-08 Voith Patent Gmbh Verfahren zum Reinigen von wiederaufzubereitenden Papiermaschinenbespannungen
DE102015217104A1 (de) 2015-09-08 2017-03-09 Voith Patent Gmbh Verfahren und Verwendung einer Einrichtung zum Wiederaufbereiten von Kunststoffen

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DE102010003196A1 (de) 2011-09-29

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